Dialecticus writes: According to an article by Lewis Page at The Register, NASA says that most theoretical models of global warming fail to take into account the cooling effects of how plant life would react to higher CO2 levels in the atmosphere. NASA's new model reportedly indicates that even something as extreme as a doubling of current CO2 levels would only result in a 1.64 degree Celsius increase in overall global temperatures, with temperature increases over land being even less than that. The article does not specifically mention whether increased photosynthesis would have a natural regulating effect on CO2 levels due to the commensurate increase in the rate of naturally occurring carbon sequestration.